CN102547878B - Method and system for realizing mobility of mobile relay - Google Patents
Method and system for realizing mobility of mobile relay Download PDFInfo
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- CN102547878B CN102547878B CN201110398907.4A CN201110398907A CN102547878B CN 102547878 B CN102547878 B CN 102547878B CN 201110398907 A CN201110398907 A CN 201110398907A CN 102547878 B CN102547878 B CN 102547878B
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Abstract
The invention discloses a method and a system for realizing the mobility of a mobile relay. In the method, after a RN (Radio Node) switches from a source donor base station to a target donor base station, a SGW of the RN switches to the target donor base station, and a PGW of the RN is still in the source donor base station; a PDN connection built by the RN based on the PGW on the source donor base station is kept; simultaneously, a MME judges whether to build a new PDN connection according to the distance between the source donor base station and the target donor base station, if so, the MME transmits a PDN connection building message to notify the RN to build the new PDN connection; when the RN receives the PDN connection building message, the RN builds the new PDN connection based on the PGW of the target donor base station. The method uses the conception that the UE support multiple PDN connections in the EPC, solves the problem of mobility of the relay, and can still select the best PGW for providing service for the relay nodes with movement of the RN, thereby ensuring the user experience.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to the ambulant implementation method of a kind of mobile relay and realize system.
Background technology
In order to meet the new market demand, 3GPP introduces relaying (Relay) implementation in R10, provides the function of donor base station in the enb, connects one or more RN (Relay Node, via node), better cover expansion service for network provides.
Consider the high-speed railway of current extensive use, RN can be applied can provide better Consumer's Experience for UE on high ferro train.And because RN itself is a stationary nodes relative to UE, therefore the Uu link of UE is improved quality is stable.3GPP starts the research of mobile relay in R11.
But in the framework of current R10, the RN of realization is a fixing node, and itself can not move, and is not suitable for supporting mobile relay.Because in the framework of R10, PGW (Packet Data Network Gateway, packet data network gateway)/SGW (Serving GW, the gateway) function i ntegration of RN is in DeNB (Donor eNB, donor base station).If there is the movement of RN, RN will be switched in new DeNB, and RN ' the s SGW/PGW be integrated in DeNB can change along with the movement of RN.
But the process that in 3GPP specification, definition PGW reorientation is not such, in the moving process of UE, namely do not allow its PDN (Packet Data Network, Packet Data Network) to connect change.Because UE is when selected PGW sets up PDN connection, PGW can be UE distributing IP address.If PGW changes, be just necessary for UE and redistribute IP address, and the business be now connected with previous PGW will inevitably be interrupted.And the UE part of RN and the function of common UE are identical, therefore for the PGW of RN service can not change in the process of PDN connection activation.
If do not carry out any enhancing to above-mentioned framework, the mobility functions of mobile relay cannot be realized.Therefore the implementation method of mobile relay will be considered.
Have technology to propose SGW and PGW of RN to divide out at present, RN ' s PGW is still retained in DeNB at first, and RN ' s SGW is arranged in the DeNB of RN access all the time along with the switching of RN.
Although the method solves PGW unalterable problem when RN moves, along with RN moves more and more far away, the path of datum plane will be more and more longer.Therefore the mobility problem of RN under current R10 framework only can not be solved by the method.
Summary of the invention
The invention provides the ambulant implementation method of a kind of mobile relay and via node, this process employs in EPC and the concept that many PDN connect is supported to UE, solve the mobility problem of RN, and can along with the movement of RN, still select the PGW of most suitable (recently) to provide service for RN, ensure that the experience of user thus.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses the ambulant implementation method of a kind of mobile relay, the method comprises:
Via node RN is from after source donor base station is switched to target donor base station, and the gateway SGW of this RN is switched in target donor base station, and the packet data gateway PGW of described RN is still arranged in described source donor base station;
Described RN connects based on the grouped data network PDN that the PGW on the donor base station of source sets up and retains;
Meanwhile, whether Mobility Management Entity MME should set up new PDN according to this RN of the Distance Judgment between source donor base station and target donor base station connects, and is send the instruction of PDN connection establishment, notifies that this RN should set up new PDN and connect;
When described RN receives the instruction of above-mentioned PDN connection establishment, the PGW of based target donor base station sets up new PDN and connects.
In the above-mentioned methods, whether described MME RN according to the Distance Judgment between described source donor base station and target donor base station sets up new PDN and connects and comprise:
When determining that according to prerequisite the distance between described source donor base station and target donor base station meets pre-conditioned, described via node should not be set up new PDN and connect;
When determining that according to prerequisite the distance between source donor base station and target donor base station does not meet pre-conditioned, described via node should initiate PDN connection establishment process, and the PGW of based target donor base station sets up new PDN and connects.
In the above-mentioned methods, described prerequisite comprises:
When described source donor base station and target donor base station are provided service by the Mobility Management Entity MME in same Mobility Management Entity pond, then determine that the distance between described source donor base station and target donor base station meets pre-conditioned;
MME in the Mobility Management Entity pond that described source donor base station is different by two with target donor base station provides service, and for target donor base station provide the MME of service determine select new PGW be described relay node services time, then determine that the distance between source donor base station and target donor base station meets pre-conditioned.
In the above-mentioned methods, when judging that should set up new PDN connects, the method comprises further:
The business that via node is performing before switching uses the described PDN set up based on the PGW of source donor base station to connect;
The new PDN that the business initiated after via node switches uses the PGW of described based target donor base station to set up connects.
In the above-mentioned methods, the method comprises further:
Business before described via node switches all at the end of, initiate PDN by described via node and connect deactivation process and remove described PDN connection of setting up based on the PGW of source donor base station.
The invention also discloses that a kind of mobile relay is ambulant realizes system, this system comprises:
MME, for at RN from after source donor base station is switched to target donor base station, judge whether that should set up new PDN connects according to described prerequisite, and when determining that described RN should set up new PDN connection, send the instruction of PDN connection establishment, notify that described RN should set up new PDN and connect;
RN, for when receiving the instruction of described PDN connection establishment, initiates PDN connection establishment process, and the PGW of based target donor base station sets up new PDN and connects.
In said system, this MME comprises memory module, judging module and message reception module;
Wherein, memory module, for preserving the prerequisite pre-set;
Judging module: at RN from after source donor base station is switched to target donor base station, judge whether that should set up new PDN connects according to described prerequisite;
Message transmission module: during for determining that when described judging module described RN should set up new PDN connection, send the instruction of PDN connection establishment, notifies that described RN should set up new PDN and connect.
In the MME of said system,
Described judging module, for when described source donor base station and target donor base station are provided service by the Mobility Management Entity MME in same Mobility Management Entity pond, then determine that the distance between described source donor base station and target donor base station meets pre-conditioned, new PDN should not be set up and connect;
MME in the Mobility Management Entity pond that described source donor base station is different by two with target donor base station provides service, and for target donor base station provide the MME of service determine select new PGW be described relay node services time, then determine that the distance between source donor base station and target donor base station does not meet pre-conditioned, new PDN should be set up and connect.
In said system, this RN comprises: message reception module and PDN connection establishment module;
Wherein, message reception module, for receiving the instruction of the PDN connection establishment from MME;
PDN connection establishment module, for when receiving the PDN connection establishment instruction from MME, initiate new PDN connection establishment process, the PDN set up based on the PGW in current donor base station connects.
In said system, this RN comprises further:
PDN connects and removes module, for the business before switching when described via node all at the end of, initiate PDN and connect deactivation process and remove described PDN connection of setting up based on the PGW of source donor base station.
From above-mentioned, the invention discloses the ambulant implementation method of a kind of mobile relay and realize system.In the method, via node RN is from after source donor base station is switched to target donor base station, and its gateway SGW is switched in this target donor base station, and its packet data gateway PGW is still arranged in described source donor base station; RN connects based on the grouped data network PDN that the PGW on the donor base station of source sets up and retains; Meanwhile, whether Mobility Management Entity sets up new PDN according to the Distance Judgment between source donor base station and target donor base station connects, and is, notifies that RN should set up new PDN and connect; When described RN receive MME notify that RN should set up the message that new PDN connects time, the PGW of described RN based target donor base station sets up new PDN and connects.This method make use of in EPC and supports to UE the concept that many PDN connect, solve the mobility problem of relaying, and along with the movement of via node, the PGW of most suitable (recently) still can be selected to provide service for via node, ensure that the experience of user thus.
Accompanying drawing explanation
Fig. 1 is that the RN mobility in the embodiment of the present invention realizes and data path figure;
To be that a kind of mobile relay in the embodiment of the present invention is ambulant realize system construction drawing to Fig. 2.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the drawings and specific embodiments.
In existing scheme, PGW and SGW of RN must be integrated in DeNB, is exactly because this integration mode, makes RN in moving process, cause PGW to need to change.The present invention proposes a kind of method, SGW and the PGW function of RN is taken apart, might not require all to be arranged in same DeNB.That is, when RN moves, the PGW node of RN can be positioned at the DeNB of the current access of RN, also can be positioned at other DeNB, the DeNB of access as previous in RN.
Fig. 1 is that the RN mobility in the embodiment of the present invention realizes and data path figure.RN first accesses DeNB1.Now the PGW (RN ' s PGW) of RN is also arranged in DeNB1.The data path of UE is by DeNB1, RN ' s SGW and RN ' s PGW, be connected to the SGW/PGW of UE, as the path of a dotted line in Fig. 1.
RN is from after source donor base station DeNB1 is switched to target donor base station DeNB2, and the SGW of this RN is switched in DeNB2, and the PGW of RN is still arranged in DeNB1; RN connects based on the PDN that the PGW on DeNB1 sets up and retains; Meanwhile, whether Mobility Management Entity MME should set up new PDN according to this RN of Distance Judgment between source donor base station DeNB1 and target donor base station DeNB2 connects, and is send the instruction of PDN connection establishment, notifies that this RN should set up new PDN and connect; When this RN receives above-mentioned PDN connection establishment message, the PGW of based target donor base station DeNB2 sets up new PDN and connects.
That is, after RN switches, be connected to DeNB2.Now RN ' s SGW transfers in new DeNB2 along with the movement of RN, and existing RN ' s PGW does not change, and can connect in the face of new RN ' s PGW set up new PDN.Here two kinds of situations are had.
1) when determining that according to prerequisite the distance between described source donor base station and target donor base station meets pre-conditioned, RN does not set up new PDN and connects, namely, distance between the DeNB2 and previous RN ' the s PGW place DeNB 1 providing service of new access meets pre-conditioned, think that both are separated by not far, only have the SGW of RN along with switched and transferred is to DeNB2, and PGW is still retained in DeNB 1.Now, the data path of UE just arrives UE ' s SGW/PGW again through RN ' the s PGW of RN ' s SGW to the DeNB 1 of DeNB2.As dashed path in Fig. 1.
2) when determining that according to prerequisite the distance between source donor base station and target donor base station does not meet pre-conditioned, that is, distance between the DeNB2 of new access and previous RN ' the s PGW place DeNB1 providing service does not meet pre-conditioned, when thinking that it is separated by very far away, RN initiates PDN connection establishment process, and the RN ' sPGW in based target donor base station sets up new PDN and connects.
Now, the PDN that the business that via node is performing before switching uses the PGW based on source donor base station to set up connects.Namely original PDN of original UE connects still via RN ' the s PGW route (as dashed path in Fig. 1) of DeNB1; The new PDN that the business initiated after via node switches uses the PGW of described based target donor base station to set up connects, that is, the PDN that UE newly initiates connects RN ' the s PGW route (as two-point drawing thread path in Fig. 1) via DeNB2.Business before via node switches all at the end of, initiate PDN by this RN and connect deactivation process and remove the PDN connection of setting up based on the PGW of source donor base station, the PGW of this source donor base station does not re-use.
Because when determining network topology framework, general is all determine whether base station provides service by same MME according to geographical position, or whether MME belongs to same Mobility Management Entity pond MME Pool, therefore, wherein the determination of prerequisite can in the following ways, but be not limited to under type:
1) when source donor base station and target donor base station are provided service by the MME in same MME Pool, then determine that the distance between source donor base station and target donor base station meets pre-conditioned, RN should not set up new PDN and connect.Wherein, provide service to comprise by the MME in same MME Pool: to provide service by the different MME in same MME Pool, or provide service by the same MME in same MME Pool.
2) when the MME in the MME Pool that source donor base station is different by two with target donor base station provides service, and for target donor base station provide the MME of service determine to select new PGW for this RN serve time, then determine that the distance between source donor base station and target donor base station does not meet pre-conditioned, RN should initiate new PDN connection establishment process, and the PGW of based target donor base station sets up new PDN and connects.
Meanwhile, in order to realize this function, in this framework, communicating between the S GW in the PGW in the donor base station of source and target donor base station is realized by S5/S8 interface function.Namely the S5/S8 interface function between SGW and PGW will be introduced between DeNB.
To be that a kind of mobile relay in the embodiment of the present invention is ambulant realize system construction drawing to Fig. 2.As shown in Figure 2, this system comprises:
MME, for at RN from after source donor base station is switched to target donor base station, the SGW of this RN is switched in this target donor base station, the PGW of this RN is still arranged in this source donor base station, judge whether that should set up new PDN connects according to prerequisite, and when determining that described RN needs to set up new PDN connection, send PDN connection establishment message, notify that described RN should set up new PDN and connect;
RN, for when receiving above-mentioned PDN connection establishment message, initiates PDN connection establishment process, and the PGW of based target donor base station sets up new PDN and connects.
Wherein, the MME in this system comprises again memory module 201, judging module 202 and message transmission module 203;
Memory module 201, for preserving the prerequisite pre-set;
Judging module 202, at RN from after source donor base station is switched to target donor base station, judge whether that should set up new PDN connects according to above-mentioned prerequisite;
Message transmission module 203, during for determining that when judging module 202 RN should set up new PDN connection, sends the instruction of PDN connection establishment, notifies that this RN should set up new PDN and connect.
Arranging of prerequisite can in the following ways, but be not limited to under type:
1) when source donor base station and target donor base station are provided service by the MME in same MME Pool, then determine that the distance between source donor base station and target donor base station meets pre-conditioned, new PDN should not be set up and connect;
2) when the MME in the MME Pool that source donor base station is different by two with target donor base station provides service, and for target donor base station provide the MME of service determine select new PGW be RN service time, then determine that the distance between source donor base station and target donor base station does not meet pre-conditioned, new PDN should be set up and connect.
RN in this system comprises: message reception module 301 and PDN connection establishment module 302;
Wherein, message reception module 301, indicates for the PDN connection establishment received from MME;
PDN connection establishment module 302, for when receiving the instruction from the PDN connection establishment of MME, initiates new PDN connection establishment process, and the PDN set up based on the PGW in current donor base station connects.
This RN comprises PDN further and connects and remove module, for the business that performing before switching as RN all at the end of, initiate PDN and connect deactivation process and remove the PDN connection that the PGW based on source donor base station sets up.
The invention discloses the ambulant implementation method of a kind of mobile relay and realize system.In the method, via node RN is from after source donor base station is switched to target donor base station, and its gateway SGW is switched in this target donor base station, and its packet data gateway PGW is still arranged in described source donor base station; RN connects based on the grouped data network PDN that the PGW on the donor base station of source sets up and retains; Meanwhile, whether Mobility Management Entity sets up new PDN according to the Distance Judgment between source donor base station and target donor base station connects, and is, notifies that RN should set up new PDN and connect; When described RN receive MME notify that RN should set up the message that new PDN connects time, the PGW of described RN based target donor base station sets up new PDN and connects.This method make use of in EPC and supports to UE the concept that many PDN connect, solve the mobility problem of relaying, and along with the movement of via node, the PGW of most suitable (recently) still can be selected to provide service for via node, ensure that the experience of user thus.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. the ambulant implementation method of mobile relay, it is characterized in that, the method comprises:
Via node RN is from after source donor base station is switched to target donor base station, and the gateway SGW of described RN is switched in described target donor base station, and the packet data gateway PGW of described RN is still arranged in described source donor base station;
Described RN connects based on the grouped data network PDN that the PGW on the donor base station of source sets up and retains;
Meanwhile, whether Mobility Management Entity MME RN according to the Distance Judgment between described source donor base station and target donor base station should set up new PDN connects, and is send the instruction of PDN connection establishment, notifies that described RN should set up new PDN and connect;
When described RN receives the instruction of described PDN connection establishment, the PGW of based target donor base station sets up new PDN and connects;
Wherein, described Mobility Management Entity RN according to the distance between described source donor base station and target donor base station judges whether that should set up new PDN connection comprises:
When determining that according to prerequisite the distance between described source donor base station and target donor base station meets pre-conditioned, described via node should not be set up new PDN and connect;
When determining that according to prerequisite the distance between source donor base station and target donor base station does not meet pre-conditioned, described via node should initiate PDN connection establishment process, and the PGW of based target donor base station sets up new PDN and connects;
Wherein, described prerequisite comprises:
When described source donor base station and target donor base station are provided service by the Mobility Management Entity MME in same Mobility Management Entity pond, then determine that the distance between described source donor base station and target donor base station meets pre-conditioned;
MME in the Mobility Management Entity pond that described source donor base station is different by two with target donor base station provides service, and for target donor base station provide the MME of service determine select new PGW be described relay node services time, then determine that the distance between source donor base station and target donor base station does not meet pre-conditioned.
2. method according to claim 1, is characterized in that, when judging that should set up new PDN connects, the method comprises further:
The business that via node is performing before switching uses the described PDN set up based on the PGW of source donor base station to connect;
The new PDN that the business initiated after via node switches uses the PGW of described based target donor base station to set up connects.
3. method according to claim 1, is characterized in that, the method comprises further:
Business before described via node switches all at the end of, initiate PDN by described via node and connect deactivation process and remove described PDN connection of setting up based on the PGW of source donor base station.
4. mobile relay is ambulant realizes a system, and it is characterized in that, this system comprises:
MME, for at RN from after source donor base station is switched to target donor base station, judge whether that should set up new PDN connects according to prerequisite, and when determining that described RN should set up new PDN connection, send the instruction of PDN connection establishment, notify that described RN should set up new PDN and connect;
RN, for when receiving the instruction of described PDN connection establishment, initiates PDN connection establishment process, and the PGW of based target donor base station sets up new PDN and connects;
This MME comprises memory module, judging module and message transmission module;
Wherein, memory module, for preserving the prerequisite pre-set;
Judging module: at RN from after source donor base station is switched to target donor base station, judge whether that should set up new PDN connects according to described prerequisite;
Message transmission module: during for determining that when described judging module described RN should set up new PDN connection, send the instruction of PDN connection establishment, notifies that described RN should set up new PDN and connect;
Described judging module, for when described source donor base station and target donor base station are provided service by the Mobility Management Entity MME in same Mobility Management Entity pond, then determine that the distance between described source donor base station and target donor base station meets pre-conditioned, new PDN should not be set up and connect;
MME in the Mobility Management Entity pond that described source donor base station is different by two with target donor base station provides service, and for target donor base station provide the MME of service determine select new PGW be described relay node services time, then determine that the distance between source donor base station and target donor base station does not meet pre-conditioned, new PDN should be set up and connect.
5. system according to claim 4, is characterized in that, this RN comprises: message reception module and PDN connection establishment module;
Wherein, message reception module, for receiving the instruction of the PDN connection establishment from MME;
PDN connection establishment module, for when receiving the PDN connection establishment instruction from MME, initiate new PDN connection establishment process, the PDN set up based on the PGW in current donor base station connects.
6. system according to claim 4, is characterized in that, described RN comprises further:
PDN connects and removes module, for the business before switching when described via node all at the end of, initiate PDN and connect deactivation process and remove described PDN connection of setting up based on the PGW of source donor base station.
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| JP6667662B2 (en) | 2015-12-28 | 2020-03-18 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Route processing method and apparatus, and terminal |
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Effective date of registration: 20170830 Address after: 100070, No. 188, building 25, No. eighteen, South Fourth Ring Road, Fengtai District, Beijing, 1, 101 Patentee after: Beijing Haiyun Technology Co. Ltd. Address before: 510663, No. 3, color road, Science City, Guangzhou Development Zone, Guangdong Patentee before: New Post Communication Equipment Co., Ltd. |